Method and compound for repelling insects



Patented Aug. 29, 1933 UNITED STATES PATENT. OFFICE Alfred Markowsky, Woodh'llfi N. I.

Application October 6, 1927 Serial No. 324,522

1 Claim. (01- 167-40) My invention relates to a mixture or compoundforrepellingandkillinginsectssuchas more particularly the clothes moth, and to render innocuous and harmless its secretions, 5 deposits and larva, as also those of other insects, injuriousto fursandwearing apparel generally, and to do this in a perfectly convenient, simple and reliable manner, while at the same time protecting the articles treated in accordance with my invention from fresh incursions ofmothsorthelikeduringthenearfuture.

It is an object of this invention to produce an insecticidal and repellent composition which is of a volatile nature, the evaporation of which 5 iscontrolledtoalargeextenhonethatisreadily andsafelyhandledandappliedthathasan odor relatively inoffensive and usually rather pleasant tohuman senses, and one that will not deliquesce in summerheat andthereby leave an undesiredmarkorstainupondelicatefabrics.

By the expression summer heat" ismeant temperatures in shaded localities or indoors from 80F.t0100'orthereahouts.

Itisnotintendedtolimitthisinventiontoany mbstancesortothenumber-ofthem whichmaybecompoundedorassociatedasthis applicanthasreason tobelieveothermaterials than those hereinafter set forth may be found. bysimplemwhichwillaccomplishinacertaininferiordegree the'obiects of thisinventlon.

'lhefollowingisgivenastheresultofanumber ofyearsofexperhneutandresearchandasthe preierredmixturesndmaterialscomprisingthis invention.

The substances discovered by me to be most :tisiactory are paradichlorbennene and paratrochlorbennene. 'lhemeltingpointofthembstanceiirstnamed istS'C.,andof thesecondsubstance83'C.

All the mixtures will withstand practically 56 C. Paranitrochlorbenzene and paradichlorbenzene mixed in the proportions 20:80, :60, :50, 00:40, get greasy at 61 0., becoming quite undesirable. A mixture of 80% paranitrochlorbenzene and 20% paradichlorbenzene holds good to 69 C.

I have found that in all mixtures of these two substances the evaporation of the more volatfle paradichlorbenzene, which has the lower boiling point and melting point, is retarded by the pre.- ence of the other substance, and this retardation is of such amount as to maintain the desired protective eiiect for a considerable length of time, quite long enough to carry the protection 70 through the heated period of an ordinary summer season. The mixtures are found to evaporate without residue, marks or stains of any description being left upon the most delicate fabrics, andanyremainingodor,andwhichisnotin itself unpleasant, may be quickly dispelled by airingthegarmentsintheusualmanner. A distinct advantage found in using the substances named is that they are not expensive.

The mixture is applied to the garments in granularform,orinsmallbodiesorballs,in cakes, or in suitable containers placed in trunks, chats or closets and wardrobes.

Having now described this invention and the manner of its use, I claim:-

A mixture for the protection of garments from moths and the like consisting of paraotherwherebythemixturecontainsatleastm'fi of paranitrochlorbensene will not soften suflicientlyto smear garments atdegrees of excessive summer heat up to l".

' ALI'RIDMARKOWBKY. u 

